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PRIMECAP increased IEX position by 1,496,207 shares

Mar 28, 2026Last updated Apr 16, 2026

This StonkWhisper whale intelligence report documents significant institutional position changes in $IEX based on SEC 13F filings and block-level trading data. Quarterly 13F disclosures are required for institutional investment managers with at least $100 million in qualifying assets under management. These filings reveal long positions in U.S. equities held as of quarter end. Material changes in institutional positioning — particularly from concentrated funds with a history of high-conviction bets — are tracked by StonkWhisper as leading indicators of institutional thesis formation or exit.

PRIMECAP MANAGEMENT CO/CA/ AUM: $132.1B INCREASED

AUM: $132.1B · 319 holdings · Period: 2025-12-31

+1,496,207 Share Change

3,226,787 Current Shares

$574.2B Current Value

0.43% Portfolio %

+86.5% Change %

Position Change Detail

Issuer IDEX CORP

Ticker IEX

Shares 1,730,580 → 3,226,787 +1,496,207

Value $281.7B → $574.2B

Portfolio Weight 0.43%

Change Type Increased

Period of Report 2025-12-31

Other PRIMECAP Positions This Period

Ticker	Issuer	Change Type	Share Change	Value
WFC	WELLS FARGO CO NEW	Decreased	6,566,583	$779.2B
SONY	SONY GROUP CORP	Decreased	6,140,660	$1492.5B
NWL	NEWELL BRANDS INC	Decreased	5,309,046	$32.4B
OPTU	ALTICE USA INC	Exited	4,869,860	—
MU	MICRON TECHNOLOGY INC	Decreased	4,860,499	$7076.7B
CHV	CHEVRON CORP NEW	Decreased	4,037,474	$354.4B
NFLX	NETFLIX INC	Increased	+3,826,870	$377.2B
ELAN	ELANCO ANIMAL HEALTH INC	Decreased	3,744,068	$1045.8B
INTC	INTEL CORP	Decreased	3,273,242	$2809.3B
AZN	ASTRAZENECA PLC	Decreased	2,942,710	$3393.6B

Other Whales Moving IEX This Period

Manager	Change Type	Share Change
Dodge & Cox	Increased	+918,208
Millennium	Increased	+793,530
Balyasny	Increased	+718,137
Schonfeld	Increased	+285,506
Arrowstreet	Increased	+269,281
American Century	New	+262,617
Renaissance Tech	Exited	170,425
Point72	Increased	+149,302
Robeco	Increased	+141,547
DE Shaw	Decreased	131,319

View all sentiment, news, and whale activity for IEX (IDEX CORP).

Track PRIMECAP and other whale moves in real time on The Wire →

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Data sourced from SEC 13F institutional holdings filings. This page does not constitute financial advice. StonkWhisper presents public records — it does not verify or guarantee the accuracy of institutional filings. 13F filings are reported quarterly and may lag actual positions.

Last updated: April 16, 2026 at 06:01 UTC